Photocatalytic Crystalline and Amorphous TiO2 Nanotubes Prepared by Electrospinning and Atomic Layer Deposition

In this work core/shell composite polymer/TiO2 nanofibers and from those TiO2 nanotubes were prepared. First, poly(vinyl alcohol) (PVA) and poly(vinylpyrrolidone) (PVP) fibers were synthetized by electrospinning. They were covered with a 100 nm thick amorphous TiO2 layer by atomic layer deposition a...

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Published in:Molecules (Basel, Switzerland) Switzerland), 2021-09, Vol.26 (19), p.5917
Main Authors: Kéri, Orsolya, Kocsis, Eszter, Karajz, Dániel Attila, Nagy, Zsombor Kristóf, Parditka, Bence, Erdélyi, Zoltán, Szabó, Anna, Hernádi, Klára, Szilágyi, Imre Miklós
Format: Article
Language:English
Subjects:
ALD
Alternative energy sources
amorphous
Anatase
Annealing
Atomic layer epitaxy
Carbon
Catalytic activity
Composite materials
Crystal structure
Crystallinity
Crystallization
Decomposition
Dissolution
Electrospinning
Fibers
Morphology
Nanocomposites
Nanofibers
Nanostructured materials
Nanotechnology
nanotube
Nitrogen
Photocatalysis
Polymers
Polyvinyl alcohol
Polyvinylpyrrolidone
Scanning electron microscopy
Spectrum analysis
TiO2
Titanium dioxide
Ultraviolet radiation
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Summary:In this work core/shell composite polymer/TiO2 nanofibers and from those TiO2 nanotubes were prepared. First, poly(vinyl alcohol) (PVA) and poly(vinylpyrrolidone) (PVP) fibers were synthetized by electrospinning. They were covered with a 100 nm thick amorphous TiO2 layer by atomic layer deposition at 50 °C. Later the polymer core was removed by two different methods: dissolution and annealing. In the case of dissolution in water, the as-prepared TiO2 nanotubes remained amorphous, while when annealing was used to remove the polymers, the TiO2 crystallized in anatase form. Due to this, the properties of amorphous and crystalline TiO2 nanotubes with exactly the same structure and morphology could be compared. The samples were investigated by SEM-EDX, ATR-IR, UV-Vis, XRD and TG/DTA-MS. Finally, the photocatalytic properties of the TiO2 nanotubes were studied by decomposing methyl-orange dye under UV light. According to the results, crystalline anatase TiO2 nanotubes reached the photocatalytic performance of P25, while amorphous TiO2 nanotubes had observable photocatalytic activity.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules26195917